Improvement in lathe-chucks



UNITED STATES 'r OFFICE.

ALFRED H. WAGNER, OF PRAIRIE CITY, ILL., ASSIGOR TO HIMSELF, WILLIAM J.RANDOLPH, LEVI DAY, AND ADAM HARSHBERGER, OF SAME PLACE.

IMPROVEMENT IN LATHE-CHUCKS.

Specifcationrforming part of Letters Patent No. 116,649, dated July 4,1871.

To all whom 'it may concern:

Be it known that I, ALFRED H. WAGNER, of Prairie City, in the county ofMcDonough and in the State of Illinois, have invented certain new anduseful Improvements in Chucks for Lathes; and do hereby decla-re thatthe following is a full, clear, and exact description thereof, referencebeing had to the accompanying drawing and to the letters of referencemarked thereon making a part of this specification.

rIhe nature of my invention consists in the construction and arrangementot' a self-centering chuck for the use of jewelers, machinists, Ste.,and other purposes.

In order to ena-ble others skilled in the art to which my inventionappertains to make and use the same, I will now proceed to describe itsconstruction and operation, referring to the annexed drawing', in whichFigure l is a plan view, the top plate being removed; and Fig. 2 is aside view of my chuck.

A represents a box or slotted block, provided with a screw, B, forinserting in the lathe. In

this box are pivoted two jaws, C C. Each qjaw works on its own center a.and into the other, at the base, by one or more cogs, b, in such a waythat, if either jaw be pushed to the center, the other must meet itthere; and as there is no spring or any screw-thread to wear out, andthus lose the power of perfect work, it must be necessarily a perfecttool at all times. Through the jaws, outside of the front end of the boxA, passes a screwbolt, D, surrounded between the jaws by a spiralspring, d, to force` them apart, and on the end of said bolt is athumb-nut, E, to force the jaws together.

H avin g thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

In combination with the box A and screw B, thejaws C C, each working onits own center and into each other by one or more cogs, b, and regulatedby the screw D, spring d, and nut E, all constructed'and arrangedsubstantially as and for the purposes herein set forth.

In testimony that I claim the foregoing I have hereunto set my hand thisL1th day of April, 1871.

ALFRED H. VAGNER.

Witnesses H. C. SANFORD, IsAAc WEAVER.

